I have been researching the Deverell family and have quite a lot of information about your ancestors in North Marston and Swanbourne. This information goes back to 1624 and up to the present day. My ancestors originate from Swanbourne and I have a direct link back to a John Deverell died 1542. It is quite a family history!! Please let me have your address and I will send you some information.Best regards.